Additional Practice ProblemsMagnetism and Its Uses  
  • 1.If a transformer has 150 turns in the primary coil but only 10 turns in the secondary coil and the output voltage is 10 V what is the input voltage?

    1. 180 V

    2. .8 V

    3. .666 V

    4. 150 V

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 2.How many turns are in the primary coil if the input voltage is 16 V, the output voltage is 8 V, and the secondary coil has 15 turns?

    1. 25 turns

    2. 30 turns

    3. 7.5 turns

    4. 10 turns

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 3.You have a transformer with 50 turns in the primary coil and 35 turns in the secondary coil. How much is the input voltage if the output voltage is 25 V?

    1. 17.5 V

    2. .7 V

    3. 35.7 V

    4. 1.45 V

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 4.How many turns are in the secondary coil if a transformer outputs 3V and inputs 10 V while the primary coil has 90 turns?

    1. 30 turns

    2. 283.3 turns

    3. 150 turns

    4. 27 turns

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 5.A transformer has 500 turns in the secondary coil and 600 turns in the primary coil. If the input voltage is 1000 V, what is the output voltage?

    1. 833.3 V

    2. 1200 V

    3. 300 V

    4. 500 V

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 6.A transformer increases the input voltage from 24 V to 480 V. What is the ratio of the number of wire turns on the primary coil to the number of turns on the secondary coil?

    1. 2:1

    2. 20:1

    3. 100:1

    4. 1:50

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 7.A step-down transformer decreases the input voltage from 5000 V to just 250 V. How many turns are in the secondary coil if 100 are in the primary coil?

    1. 10 turns

    2. 20 turns

    3. 5 turns

    4. 15 turns

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 8.A transformer decreases the input voltage from 500 V to 25 V. What is the ratio of the number or wire turns on the primary coil to the number of turns on the secondary coil?

    1. 50:25

    2. 2:1

    3. 1:2

    4. 1:20

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 9.If a transformer has 1500 turns in the primary coil but only 50 turns in the secondary coil and the output voltage is 35 V, what is the input voltage?

    1. 1050 V

    2. 1500V

    3. 1005 V

    4. 1200 V

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil
  • 10.A step-down transformer decreases the input voltage from 550 V to just 250 V. How many turns are in the secondary coil if 100 are in the primary coil?

    1. 54.54 turns

    2. 45.45 turns

    3. 50 turns

    4. 45 turns

    • Feedback: Transformer Voltage Equation: output voltage (in volts) ÷ input voltage (in volts) = turns in secondary coil ÷ turns in primary coil

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